Rewrite std::string("") to std::string(), Linux edition.

chrome/browser/safe_browsing/browser_feature_extractor.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/safe_browsing/browser_feature_extractor.h"
 
 #include <map>
 #include <utility>
 
 #include "base/bind.h"
@@ skipping 190 matching lines @@
         break;
       }
     }
   }
 
   // Add features pertaining to how we got to
   //   1) The candidate url
   //   2) The first url on the same host as the candidate url (assuming that
   //      it's different from the candidate url).
   if (url_index != -1) {
-    AddNavigationFeatures("", controller, url_index, info->url_redirects,
-                          request);
+    AddNavigationFeatures(
+        std::string(), controller, url_index, info->url_redirects, request);
   }
   if (first_host_index != -1) {
     AddNavigationFeatures(features::kHostPrefix,
                           controller,
                           first_host_index,
                           info->host_redirects,
                           request);
   }
 
   ExtractBrowseInfoFeatures(*info, request);
@@ skipping 257 matching lines @@
                                                     Profile::EXPLICIT_ACCESS);
     if (*history) {
       return true;
     }
   }
   VLOG(2) << "Unable to query history.  No history service available.";
   return false;
 }
 
 }  // namespace safe_browsing